By most accounts, this is a home run hire, but I understand that his defense can be complex with a bit of a learning curve. Supposedly, this explains why the PSU defense looked bad at times. Assuming that it takes players time to learn and look bad initially, it will require some patience on the part of fans to let Knowles put the pieces together. That may be hard for some folks. On the other hand, most of us would be happy to see an upgrade in their ability to tackle on contact. Watching Indiana, I was impressed at the way they could tackle.